As this is still in beta, I am sure that things like FLAC support (biggest reason I used WinAmp on Windows) and Smart Playlists and such will be coming. The main goal of Winamp for Mac Sync Beta is to give Android users a way to sync their phones' music with their Mac computers and to increase Winamp's popularity.

As an iPhone/Mac user, I still use Winamp Mac Sync Beta, as it a lighter-weight alternative to iTunes.